Snow tonight especially over mountain passes
Several waves of energy will bring round after round of light snowfall to the area for at least the next 7-10 days. The first wave will occur tonight and into Monday morning.
Accumulating snowfall will occur over mountain passes, especially along the MT/ID border, including Lolo, Lost Trail, and Lookout Passes. Accumulations will range from 3-7" by Monday night. Valley locations will see significantly less snowfall as a result of down sloping effects. However, between a trace and 2 inches of snow is possible in valleys area-wide.
Snow will begin in NW Montana by around 10PM Sunday night and make its way into SW Montana by around 5AM Monday morning. There will also be lingering snow showers, mainly in the higher terrain in west central and NW Montana through Monday night. Low temperatures will dip into the 20s from Missoula to Kalispell and into the 10s from Butte to Bozeman.
A short break from the precipitation will occur Tuesday before another round starts Tuesday night and into Wednesday, where light accumulations are possible especially in NW Montana. Snow may transition to rain during the day Wednesday.
Yet another round of snowfall will occur area-wide Thursday as a cold front will over through and allow temperatures to fall slightly as well.